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Oil palm empty fruit bunch extract as green corrosion inhibitor for mild steel in hydrochloric acid solution: Central composite design optimization
Author(s) -
Haris Nur Izzah Nabilah,
Sobri Shafreeza,
Kassim Norazila
Publication year - 2019
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201810653
Subject(s) - hydrochloric acid , central composite design , physisorption , adsorption , corrosion , corrosion inhibitor , fourier transform infrared spectroscopy , langmuir adsorption model , nuclear chemistry , materials science , composite number , response surface methodology , scanning electron microscope , chemical engineering , chemistry , palm oil , metallurgy , composite material , chromatography , organic chemistry , food science , engineering
Oil palm empty fruit bunch (OPEFB) extract was evaluated as corrosion inhibitor for mild steel corrosion in 1 M hydrochloric acid using weight loss technique. OPEFB extract was prepared at various concentrations of 0.2–1.0 v/v% for preliminary study. Central composite design (CCD)‐based optimization was engaged to analyze the factors and to maximize inhibition efficiency. The highest inhibition efficiency was estimated up to 99.95%. Fourier transform infrared (FTIR) and scanning electron microscopy (SEM) studies confirmed the presence of active compounds and deposition of extract on metal surface. Thermodynamic study revealed that the adsorption obeyed Langmuir isotherm and inhibition mechanism inclined toward physisorption.